Abstract:

The chemical precipitation process was used to treat high concentration NH3-N in wastewater, the influence of the factors such as chemicals blendinig ratio and pH value on NH3-N was studied. Under suitable conditions, the pure and clean MAP crystal can be obtained, the removal rate for NH3-N can be reached to 98%. At the temperature of 100℃, heated for 3 hours and MAP was decomposed, the composed substance can be used for the removal of NH3-N in wastewater in repeat, the removal rate of NH3-N can be reached to 93%, the cost of chemicals can be substantially reduced and NH3 in waste water can be recovered.